Plz help...codes P0401 P0403 & P0406 - Chrysler 300C Forum: 300C & SRT8 Forums
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post #1 of 29 (permalink) Old 11-06-2016, 02:07 PM Thread Starter
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Plz help...codes P0401 P0403 & P0406

So I have an 06 3L crd 100k on the clock and just recently my car went into limp mode...I have these codes:

P0401 EGR airflow insufficient

P0403 EGR circuit issue

P0046 turbo boost solenoid

Car has the red lightening strike flashing too.

So I have replaced the turbo boost actuator...I've removed and cleaned the EGR valve and I've took out fuse 11 and replaced it.

No fix...the car exits limp mode everytime I start it but as soon as I drive and reach 2000rpm, it jerks violently then goes into limp mode.

I'm stuck and need your help plz...

BTW I'll post a video...you will be able to see my EGR valve and you will notice the soot build-up...I didn't think it was too bad but you may know otherwise.

Cheers

Mick
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post #2 of 29 (permalink) Old 11-06-2016, 03:37 PM
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2 of the codes seem to suggest implausible voltages being detected....I dont suppose you've checked your harness for wear as the CRD seems to have a habit of shredding wiring insulation towards the rear of the engine?

Watching You Avoiding Me!

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post #3 of 29 (permalink) Old 11-06-2016, 03:46 PM Thread Starter
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Yep checked correct...I've just ordered an endoscope so I can film down the EGR flexi tube to see if there is any blockages...I'll put a resistor on the EGR plug tomorrow...if it turns out there's no blockages and the resistor fails, then I guess it's a trip to a proper mechanic rather than my inexperienced hand...ouch that might be pricy.
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post #4 of 29 (permalink) Old 11-06-2016, 04:04 PM
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By default the EGR valve is closed so fitting the resistor as mentioned in the PM should sort it, you may get a code on and off mentioning airflow but it will not cause limpmode if you still have limp mode after it is likely another cause, is the turbo actuator moving freely when the ignition is switched on and off?

have you checked the resistor on the swirl valve to be sure that is fitted ok and not causing issues?

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Last edited by Boro al; 11-06-2016 at 04:07 PM.
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post #5 of 29 (permalink) Old 11-06-2016, 04:15 PM Thread Starter
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Turbo actuator is moving freely...the waste gate veins move easily and smooth when the actuator is detached and the turbo sounds normal...when this problem struck the first thing I did was put a new turbo actuator on so I'm confident it's not that...I have a viezu remap so my car has often threw up a turbo boost fault code even though it works fine.

OBD2 points to the EGR. I'm definitely gunna try the resistor and if it removes the LHM then I'll go for a long motorway drive to burn off some carbon deposits then try the EGR valve/solenoid as normal, just for experimental reasons...I've decided that even if I do get it working I'm gunna run with a resistor anyway as I think it's better for the engine.
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post #6 of 29 (permalink) Old 11-06-2016, 06:14 PM
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Did anyone else giggle a little when you read "endoscope"?



No?



Just me? Man, I really need to grow up.

Good luck with the troubleshooting. I pee a little whenever a code pops up.

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post #7 of 29 (permalink) Old 11-07-2016, 12:40 PM Thread Starter
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post #8 of 29 (permalink) Old 11-07-2016, 12:47 PM Thread Starter
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So I did the egr resistor trick today and it took the car out of limp mode and the red lightening strike went away...?

I then went for a good drive on the motorway but the car was still jerking violently at 2000rpm and would not go over that rev range. I couldn't get over 70mph.

1 hr later car back in limp mode with new code P0234...

I switched the engine off, switched it back on and was out of limp mode with no red lightening but the car won't go over 2000rpm and jerks so bad.


I'm thinking I'll have to bite the bullet and go the stealer...right on top of Christmas too?
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post #9 of 29 (permalink) Old 11-08-2016, 01:42 AM
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Quote:
Originally Posted by Dreamcatcher300 View Post
but the car was still jerking violently at 2000rpm and would not go over that rev range.
the same symptoms i had when my actuator failed.
you say you have already replaced yours in the first post, the ebay ones, unless you find the exact same part number, are different.
i had my original unit fixed by ECUtesting in the UK. like new now.

and looking at the photo of your error codes

P0046 is T/Super Charger Boost Ctrl Solenoid Circ Range/Perf (re actuator)

P0671 is Cylinder 2 Glow Plug Circ
P0672 is Cylinder 4 Glow Plug Circ
P0674 is Cylinder 5 Glow Plug Circ
P0675 is Cylinder 6 Glow Plug Circ

4 of your 6 glow plugs have failed, do you have hart starting problems as well?

I also have a Viezu remap in mine.
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post #10 of 29 (permalink) Old 11-08-2016, 01:58 AM Thread Starter
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I checked my glow plugs and there all fine so I know the glow plug module is faulty. I'm told that's common on our cars.

I got my actuator from turbo developments in London and have confidence in them. My P0046 code has been a long standing intermittent issue likely coz of the remap.

Just learned something new today....I drove to work and never took the rpm over 1.800...still had a few bunny hops but no EML...got to work and plugged in my obd2 and the P0403 code was gone and the P0046 also good...the code P0401 was still present.

I'm booked in with my local mercedes specialists garage (my wife's cousin) so he's gunna run a full diagnostics...he reckons my EGR wiring is the likely issue.

He's only worked on a few 300c so he is interested too.

Codes on codes off different codes showing...???
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